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          <h1 class="post-title" itemprop="name headline">eos交易同步过程和区块生产过程源码分析</h1>
        

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        <h2 id="交易同步过程"><a href="#交易同步过程" class="headerlink" title="交易同步过程"></a>交易同步过程</h2><p>1 通过命令cleos调用 cleos transfer ${from_account} ${to_account} ${quantity} 发起交易<br>2 eos调用chain_plugin 的push_transaction,内部调用注册好的方法。<br><figure class="highlight cpp"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">app().get_method&lt;incoming::methods::transaction_async&gt;();</span><br></pre></td></tr></table></figure></p>
<a id="more"></a>
<p>代码截图如下<br><img src="1.png" alt="1.png"><br>在producer_plugin插件的plugin_initialize函数中提前注册了incoming::methods::transaction_async。<br><img src="2.png" alt="2.png"><br>所以实际调用了producer_plugin_impl的on_incoming_transaction_async(trx, persist_until_expired, next )函数,<br>传递的参数分别是pretty_input,true,和一个lambda匿名函数<br><figure class="highlight cpp"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br></pre></td><td class="code"><pre><span class="line">app().get_method&lt;incoming::methods::transaction_async&gt;()(pretty_input, <span class="literal">true</span>, [<span class="keyword">this</span>, next](<span class="keyword">const</span> fc::static_variant&lt;fc::exception_ptr, transaction_trace_ptr&gt;&amp; result) -&gt; <span class="keyword">void</span>&#123;</span><br><span class="line">         <span class="keyword">if</span> (result.contains&lt;fc::exception_ptr&gt;()) &#123;</span><br><span class="line">            next(result.get&lt;fc::exception_ptr&gt;());</span><br><span class="line">         &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">            <span class="keyword">auto</span> trx_trace_ptr = result.get&lt;transaction_trace_ptr&gt;();</span><br><span class="line"></span><br><span class="line">            <span class="keyword">try</span> &#123;</span><br><span class="line">               chain::transaction_id_type id = trx_trace_ptr-&gt;id;</span><br><span class="line">               fc::variant output;</span><br><span class="line">               <span class="keyword">try</span> &#123;</span><br><span class="line">                  output = db.to_variant_with_abi( *trx_trace_ptr, abi_serializer_max_time );</span><br><span class="line">               &#125; <span class="keyword">catch</span>( chain::abi_exception&amp; ) &#123;</span><br><span class="line">                  output = *trx_trace_ptr;</span><br><span class="line">               &#125;</span><br><span class="line"></span><br><span class="line">               next(read_write::push_transaction_results&#123;id, output&#125;);</span><br><span class="line">            &#125; CATCH_AND_CALL(next);</span><br><span class="line">         &#125;</span><br><span class="line">      &#125;);</span><br></pre></td></tr></table></figure></p>
<p>3 在producer_plugin_impl的on_incoming_transaction_async中调用controller的 push_transaction，并执行trx。<br>将交易插入_pending_incoming_transactions中<br><img src="3.png" alt="3.png"><br>接下来调用了controller的push_transaction函数<br><img src="4.png" alt="4.png"><br>4 controller的push_transaction函数中发送消息accepted_transaction，而目前常用的网络插件为bnet_plugin,net_plugin目前已作为备用,<br>由于在bnet_plugin的startup函数中绑定了消息回调函数<br><img src="5.png" alt="5.png"><br><figure class="highlight cpp"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">my-&gt;_on_appled_trx_handle = app().get_channel&lt;channels::accepted_transaction&gt;()</span><br><span class="line">                                .subscribe( [<span class="keyword">this</span>]( transaction_metadata_ptr t )&#123;</span><br><span class="line">                                       my-&gt;on_accepted_transaction(t);</span><br><span class="line">                                &#125;);</span><br></pre></td></tr></table></figure></p>
<p>通过app().get_channel将channels::accepted_transaction信号和lambda表达式绑定起来，所以当controller发送信号accepted_transaction就会调用这个lambda表达式传递参数，从而调用bnet_plugin_impl中on_accepted_transaction函数。<br>5  bnet_plugin_impl通过on_accepted_transaction将消息广播到其他节点<br><figure class="highlight cpp"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">on_accepted_transaction</span><span class="params">( transaction_metadata_ptr trx )</span> </span>&#123;</span><br><span class="line">            <span class="keyword">if</span>( trx-&gt;implicit || trx-&gt;scheduled ) <span class="keyword">return</span>;</span><br><span class="line">            for_each_session( [trx]( <span class="keyword">auto</span> ses )&#123; ses-&gt;on_accepted_transaction( trx ); &#125; );</span><br><span class="line">         &#125;</span><br></pre></td></tr></table></figure></p>
<p>6 其他节点收到消息后，进入on处理流程，发送transction消息<br>bnet_plugin处理消息函数<br><img src="6.png" alt="6.png"><br>transaction消息处理<br><img src="7.png" alt="7.png"><br>通过<br><figure class="highlight cpp"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">app().get_channel&lt;incoming::channels::transaction&gt;().publish(p);</span><br></pre></td></tr></table></figure></p>
<p>发送transaction消息。<br>7 producer_plugin绑定了消息处理的回调函数<br><img src="8.png" alt="8.png"><br>收到消息后，调用on_incoming_transaction_async，调用controller的 push_transaction，并执行trx。<br>以上就是eos交易同步过程。</p>
<h2 id="区块生产过程"><a href="#区块生产过程" class="headerlink" title="区块生产过程"></a>区块生产过程</h2><p>整体的区块生产流程<br><img src="9.png" alt="9.png"><br>1 检查自己是否是生产者，一个生产者500ms出一次块，共出12次之后切换生产者。<br>2 对上次确认的区块到本次的区块做BFT签名，涉及函数set_confirmed和maybe_promote_pending,具体可以参看controller中start_block函数<br>3 等待一个出块周期500ms<br>4 计算action的merkle root<br>5 计算transaction的merkle root<br>6 对区块签名<br>7 提交区块到DB<br>8 递归调用schedule_production_loop<br>区块生产流程图<br><img src="produce.png" alt="produce.png"></p>
<h2 id="区块同步过程"><a href="#区块同步过程" class="headerlink" title="区块同步过程"></a>区块同步过程</h2><p>1 参考区块生产过程，producer_plugin循环生产区块，先start_block处理BFT签名并确定不可逆的区块数，之后produce_block调用controller<br>2 controller使用finalize_block计算merkle root，使用commit_block提交到fork database中，<br>只截取commit_block部分代码<br><figure class="highlight cpp"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">commit_block</span><span class="params">( <span class="keyword">bool</span> add_to_fork_db )</span> </span>&#123;</span><br><span class="line">      <span class="keyword">try</span> &#123;</span><br><span class="line">         <span class="comment">//判断是否加入fork_db中</span></span><br><span class="line">         <span class="keyword">if</span> (add_to_fork_db) &#123;</span><br><span class="line">            pending-&gt;_pending_block_state-&gt;validated = <span class="literal">true</span>;</span><br><span class="line">            <span class="keyword">auto</span> new_bsp = fork_db.add(pending-&gt;_pending_block_state, <span class="literal">true</span>);</span><br><span class="line">            emit(self.accepted_block_header, pending-&gt;_pending_block_state);</span><br><span class="line">            head = fork_db.head();</span><br><span class="line">            EOS_ASSERT(new_bsp == head, fork_database_exception, <span class="string">"committed block did not become the new head in fork database"</span>);</span><br><span class="line">         &#125;</span><br><span class="line"></span><br><span class="line">         emit( self.accepted_block, pending-&gt;_pending_block_state );</span><br><span class="line">         emit( self.accepted_block_with_action_digests,</span><br><span class="line">            <span class="built_in">std</span>::make_shared&lt;block_state_with_action_digests&gt;(pending-&gt;_pending_block_state, pending-&gt;_action_digests) );</span><br><span class="line">      &#125; <span class="keyword">catch</span> (...) &#123;</span><br><span class="line">         <span class="comment">//....</span></span><br><span class="line">      &#125;</span><br><span class="line">   &#125;</span><br></pre></td></tr></table></figure></p>
<p>实际上controller的commit_block做了几件事<br><figure class="highlight cpp"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="number">1</span> 设置pending_block_state为有效的</span><br><span class="line"><span class="number">2</span> 调用fork_db 的add函数，携带pending_block_state并通过引用返回，函数返回值为一个新的block_state_ptr</span><br><span class="line"><span class="number">3</span> 发送accepted_block_header信号</span><br><span class="line"><span class="number">4</span> 发送accepted_block 和 accepted_block_with_action_digests信号</span><br></pre></td></tr></table></figure></p>
<p>下面展开fork_db的add函数<br><figure class="highlight cpp"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line">block_state_ptr fork_database::add( <span class="keyword">const</span> block_state_ptr&amp; n, <span class="keyword">bool</span> skip_validate_previous ) &#123;</span><br><span class="line">     <span class="comment">//取出不可逆头</span></span><br><span class="line">     my-&gt;head = *my-&gt;index.get&lt;by_lib_block_num&gt;().begin();</span><br><span class="line">     <span class="keyword">auto</span> lib    = my-&gt;head-&gt;dpos_irreversible_blocknum;</span><br><span class="line">     <span class="keyword">auto</span> oldest = *my-&gt;index.get&lt;by_block_num&gt;().begin();</span><br><span class="line">     <span class="keyword">if</span>( oldest-&gt;block_num &lt; lib ) &#123;</span><br><span class="line">        prune( oldest );</span><br><span class="line">     &#125;</span><br><span class="line">     <span class="keyword">return</span> n;</span><br><span class="line">  &#125;</span><br></pre></td></tr></table></figure></p>
<p>fork db会依据start_block中计算的不可逆区块数，将不可逆的区块删除(调用prune)，<br><figure class="highlight cpp"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">void</span> fork_database::prune( <span class="keyword">const</span> block_state_ptr&amp; h ) &#123;</span><br><span class="line">      <span class="keyword">auto</span> itr = my-&gt;index.find( h-&gt;id );</span><br><span class="line">      <span class="keyword">if</span>( itr != my-&gt;index.end() ) &#123;</span><br><span class="line">         <span class="comment">//发送不可逆信号，controller绑定了回调处理</span></span><br><span class="line">         irreversible(*itr);</span><br><span class="line">         my-&gt;index.erase(itr);</span><br><span class="line">      &#125;</span><br><span class="line">      <span class="keyword">auto</span>&amp; numidx = my-&gt;index.get&lt;by_block_num&gt;();</span><br><span class="line">      <span class="keyword">auto</span> nitr = numidx.lower_bound( num );</span><br><span class="line">      <span class="keyword">while</span>( nitr != numidx.end() &amp;&amp; (*nitr)-&gt;block_num == num ) &#123;</span><br><span class="line">         <span class="keyword">auto</span> itr_to_remove = nitr;</span><br><span class="line">         ++nitr;</span><br><span class="line">         <span class="keyword">auto</span> id = (*itr_to_remove)-&gt;id;</span><br><span class="line">         remove( id );</span><br><span class="line">      &#125;</span><br><span class="line">   &#125;</span><br></pre></td></tr></table></figure></p>
<p>并发送irreversible消息,controller绑定了该消息处理的回调函数<br><figure class="highlight cpp"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">fork_db.irreversible.connect( [&amp;]( <span class="keyword">auto</span> b ) &#123;</span><br><span class="line">                                 on_irreversible(b);</span><br><span class="line">                                 &#125;);</span><br></pre></td></tr></table></figure></p>
<p>3 controller收到消息后，调用on_irreversible处理发送irreversible_block消息。bnet注册了该消息处理的回调函数<br><figure class="highlight cpp"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">my-&gt;_on_irb_handle = app().get_channel&lt;channels::irreversible_block&gt;()</span><br><span class="line">                                .subscribe( [<span class="keyword">this</span>]( block_state_ptr s )&#123;</span><br><span class="line">                                       my-&gt;on_irreversible_block(s);</span><br><span class="line">                                &#125;);</span><br></pre></td></tr></table></figure></p>
<p>4 bnet_plugin 收到消息后，调用on_irreversible_block处理。并广播给其他节点。<br>5 controller发送accepted_block_header和accepted_block消息。<br>6 producer_plugin收到消息后， 调用on_block，calc_dpos_last_irreversible计算不可逆块。<br>7 bnet_plugin/net_plugin 收到之后广播到其他节点。<br>8 其他节点的bnet_plugin/net_plugin收到P2P消息后，发送block消息<br><figure class="highlight cpp"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">on</span><span class="params">( <span class="keyword">const</span> signed_block_ptr&amp; b )</span> </span>&#123;</span><br><span class="line">           peer_ilog(<span class="keyword">this</span>, <span class="string">"received signed_block_ptr"</span>);</span><br><span class="line">           <span class="keyword">if</span> (!b) &#123;</span><br><span class="line">              peer_elog(<span class="keyword">this</span>, <span class="string">"bad signed_block_ptr : null pointer"</span>);</span><br><span class="line">              EOS_THROW(block_validate_exception, <span class="string">"bad block"</span> );</span><br><span class="line">           &#125;</span><br><span class="line">           status( <span class="string">"received block "</span> + <span class="built_in">std</span>::to_string(b-&gt;block_num()) );</span><br><span class="line">           <span class="comment">//ilog( "recv block $&#123;n&#125;", ("n", b-&gt;block_num()) );</span></span><br><span class="line">           <span class="keyword">auto</span> id = b-&gt;id();</span><br><span class="line">           mark_block_status( id, <span class="literal">true</span>, <span class="literal">true</span> );</span><br><span class="line"></span><br><span class="line">           app().get_channel&lt;incoming::channels::block&gt;().publish(b);</span><br><span class="line"></span><br><span class="line">           mark_block_transactions_known_by_peer( b );</span><br><span class="line">        &#125;</span><br></pre></td></tr></table></figure></p>
<p>9 Producer_plugin收到block消息后调用controller的push_block函数<br>10 Controller调用apply_block判断如果新收到的block比原有的链长，则切换到新链上<br>11 Controller调用finalize_block计算merkle root，使用commit_block提交到DB<br>以上就是区块同步过程。<br>区块同步流程图<br><img src="push.png" alt="push.png"><br>感谢关注我的公众号<br><img src="1.jpg" alt="1.jpg"></p>

      
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                }
              })
            };
            if (keywords.length === 1 && keywords[0] === "") {
              resultContent.innerHTML = '<div id="no-result"><i class="fa fa-search fa-5x" /></div>'
            } else if (resultItems.length === 0) {
              resultContent.innerHTML = '<div id="no-result"><i class="fa fa-frown-o fa-5x" /></div>'
            } else {
              resultItems.sort(function (resultLeft, resultRight) {
                if (resultLeft.searchTextCount !== resultRight.searchTextCount) {
                  return resultRight.searchTextCount - resultLeft.searchTextCount;
                } else if (resultLeft.hitCount !== resultRight.hitCount) {
                  return resultRight.hitCount - resultLeft.hitCount;
                } else {
                  return resultRight.id - resultLeft.id;
                }
              });
              var searchResultList = '<ul class=\"search-result-list\">';
              resultItems.forEach(function (result) {
                searchResultList += result.item;
              })
              searchResultList += "</ul>";
              resultContent.innerHTML = searchResultList;
            }
          }

          if ('auto' === 'auto') {
            input.addEventListener('input', inputEventFunction);
          } else {
            $('.search-icon').click(inputEventFunction);
            input.addEventListener('keypress', function (event) {
              if (event.keyCode === 13) {
                inputEventFunction();
              }
            });
          }

          // remove loading animation
          $(".local-search-pop-overlay").remove();
          $('body').css('overflow', '');

          proceedsearch();
        }
      });
    }

    // handle and trigger popup window;
    $('.popup-trigger').click(function(e) {
      e.stopPropagation();
      if (isfetched === false) {
        searchFunc(path, 'local-search-input', 'local-search-result');
      } else {
        proceedsearch();
      };
    });

    $('.popup-btn-close').click(onPopupClose);
    $('.popup').click(function(e){
      e.stopPropagation();
    });
    $(document).on('keyup', function (event) {
      var shouldDismissSearchPopup = event.which === 27 &&
        $('.search-popup').is(':visible');
      if (shouldDismissSearchPopup) {
        onPopupClose();
      }
    });
  </script>





  

  

  

  
  

  

  

  

</body>
</html>
